Photographic-printing frame.



No. 683,059. Patented Supt. 24, 190i.

E. W. ICCASLIN.

PIIOTOGIIAPIIIB PRINTING FIIAIE.

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No. 683,059. Patanted Sept. 24, I90I.

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PHOTOGRAPH") PRINTING FRAIE.

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UNITED STATES PATENT OFFICE.

ELTON W. MCCASLIN, OF CHICAGO, ILLINOIS, ASSIGNOR TO MORGAN & WRIGHT, OFSAME PLACE.

PHOTOGRAPHlC-PRINTING FRAM E.

SPECIFICATION forming part of Letters Patent N 0. 683,059, datedSeptember 24, 1901.

Application filed May 15, 1901. Serial No. 60,381. (No model.)

To all whom it may concern:

Be it known that I, ELTON W. MOCASLIN, a citizen of the United States,residing at Ohicago, in the county of Cook and State of Illinois, haveinvented a certain new and use ful Improvement in Photographic-PrintingFrames, of which the following is a specification.

My invention relates to photographic-prin ting frames particularlyadapted for the production of blue-prints and involving means forexhausting air between a mat and a glass plate, so as to cause the matto smoothly and evenly clamp the drawing and printing-paper between themat and the glass.

The object of my invention is to provide an improved construction of matand to prevent leakage between the mat and the glass plate.

In the accompanying drawings, Figure 1 is a bottom view of apneumatic-printin g frame involving my invention, means for exhaustingthe air being also illustrated. Fig. 2 is a section taken transverselythrough Fig. 1. Fig. 3 is a like view of the main frame. Fig. 4illustrates the glass plate, printing-paper, a drawing, a pad, and themat in section. Fig. 5 is a section through the clamping-frame. Fig. 6shows the pad in perspective, and Fig. 7 is a like view of the mat.

The main frame A is provided with an inner ledge 1, against which theglass plate B is arranged to fit. For the purpose of making blue-printsthe printing-paper O and the drawing D are arranged between the glassplate and a mat E. The mat E is made of rubber or equivalent rubbercomposition and is molded or otherwise formed with a marginal head ormolding 2, having one or more continuous longitudinal channels 3, whichprovide it with elastic ribs 4, adapted and arranged to bear againsttheunder side of the glass plate, and thereby hermetically seal the spacebetween the glass plate and the portion of the mat which is bounded byits marginal head or molding. The arrangement of this,

head or molding provides the mat with a shallow space which is filledwith some suitably porous pad F,such as felt or the like,which said padprovides a backing for the drawing and printing-paper. A flexible tube Gconnects with an aperture through the mat and is also connected with asuitable exhaust-pump H, whereby air can be exhausted from between themat and the glass plate. The mat can be backed with a layer I of fabric,if desired, and the marginal portion of the mat is clamped against theglass plate by a clamp-frame K, which is forced against the mat byclamping devices L, consisting, for example, of swinging arms 5, pivotedto brackets 6 on the clampframe and arranged to be swung under the edgeportions of plates 7 on the main frame, the said swinging arms beingprovided with set-screws 8, which can be tightened down upon theclamp-frame when the arms are under and in engagement with the plates 7on the main frame. By thus tightening the setscrews against theclamp-frame the latter can be forced against the mat, and since the ribsof the molding or raised marginal portion of the mat engage the glassplate with a yielding spring resistance the space occupied by the pad,the drawing or copy, and the printing-paper will be hermetically sealed.

What I claim as my invention is- A pneumatic-printing frame comprising aglass plate; a main frame; a rubber mat having its marginal portionprovided with raised elastic ribs adapted to engage the glass plate; apad arranged within the space which is surrounded by the raised ribs ofthe mat, and means for clamping such marginal portion of the mat againstthe glass plate.

ELTON V. MCOASLIN.

Witnesses:

CHARLES G. PAGE, OTTILIE G. FREIBERG.

